x2 |
2 |
OA |
OB |
2 |
3 |
OA |
OB |
2 |
3 |
3 |
4 |
|b| | ||
|
1+k2 |
|
4kb |
2k2+1 |
2b2-2 |
2k2+1 |
OA |
OB |
k2+1 |
2k2+1 |
OA |
OB |
2 |
3 |
|
2 |
2 |
k2+1 |
2k2+1 |
2 |
3 |
3 |
4 |
2 |
3 |
k2+1 |
2k2+1 |
3 |
4 |
1 |
2 |
k2+1 |
2
| ||
2k2+1 |
1 |
2 |
| ||
2k2+1 |
| ||
4 |
2 |
3 |
a |
b |
OA |
a |
OB |
b |
OC |
1 |
3 |
a |
b |
a |
b |
a |
b |
a |
b |
OA |
OB |
OP |
XA |
XB |
OX |
AB |
BC |
A.直角三角形 | B.锐角三角形 |
C.钝角三角形 | D.等腰直角三角形 |
a |
7 |
2 |
1 |
2 |
b |
1 |
2 |
7 |
2 |
A.(
| B.(
| ||||||||||||||||||
C.(
| D.(
|
a |
b |
A.平行 | B.垂直 | C.相交 | D.异面 |
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